Hihi, been busy so havent been posting a lot in here. I am asking this for a friend who plans to propose to his girlfriend in the coming weeks.

To my understanding, the diamond ring will be the proposal ring used when the guy kneels down and propose to the girl. The wedding band is what you wear after you get married. Now, here's my question - how would you buy a diamond ring?

1. Would you bring your girlfriend to the goldsmith and ask her to choose?
2. Would you choose and buy a ring yourself without her knowledge

If your answer to the question above is 1. you brought her to the goldsmith and ask her to choose,
1. That will kill the suspense
2. There wont be any more surprise
3. She is already expecting it
4. She knows

If your answer to the question above is 2. you bought the ring yourself to give her a surprise proposal
1. What if size is wrong?
2. What if she dont like the design?
How many goldsmith allows exchange? Once you propose, she accept it but she dont like the design, go back to exchange - can?

Please discuss.